function test() {
    var food = 'apple';

    function a() {
        console.log(food);
        food = 'banana';
    }

    function b() {
        console.log(food);
    }
}

// a();    //apple
// b();    //banana

function fruit() {
    var food = 'apple';
    var obj = {
        eatFood: function() {
            if(food !== ''){
                console.log('I am earing ' + food);
                food = '';
            }else{
                console.log('There is nothing');
            }
        },
        pushFood: function(myFood) {
            food = myFood
        }
    }
    return obj;
}
var person = fruit();
person.eatFood();
person.eatFood();
person.pushFood('banana');
person.eatFood()